[Gambas-user] [Fwd: Gambas3 Pointers example] signal #6
Demosthenes Koptsis
demosthenesk at ...626...
Sun Jan 9 20:29:20 CET 2011
so what can i do for
char *getwd(char *buf);
?
On Sun, 2011-01-09 at 16:05 +0200, Jussi Lahtinen wrote:
> Hmmm..... you cannot do alloc with size of string.
> Size of string is depended on length of string!
>
> Jussi
>
>
> On Sun, Jan 9, 2011 at 15:59, Demosthenes Koptsis <demosthenesk at ...626...>wrote:
>
> > this example on pointers raises signal #6.
> > Gambas3 svn3432 Ubuntu 10.04, AMD64
> >
> > ---------------------------
> > ' Gambas module file
> > 'char *getwd(char *buf);
> > Extern getwd(buf As Pointer) As Pointer In "libc:6"
> >
> > Public Sub Main()
> >
> > Dim pBuf As Pointer
> > Dim pFunc As Pointer
> > Dim sWorkingDirectory As String
> >
> > 'getwd
> > pBuf = Alloc(SizeOf(gb.String))
> > pFunc = Alloc(SizeOf(gb.String))
> >
> > pFunc = getwd(pBuf)
> >
> > sWorkingDirectory = Str@(pFunc)
> > Free(pFunc)
> > Free(pBuf)
> > Print sWorkingDirectory
> >
> > End
> > ---------------------------
> >
> > output:
> > ---------------------------
> > *** glibc detected *** Pointers86: free(): invalid next size (fast):
> > 0x0000000001af39a0 ***
> > ======= Backtrace: =========
> > /lib/libc.so.6(+0x775b6)[0x7f4d6a2495b6]
> > /lib/libc.so.6(cfree+0x73)[0x7f4d6a24fe83]
> > Pointers86[0x405308]
> > Pointers86[0x422f50]
> > /lib/libc.so.6(__libc_start_main+0xfd)[0x7f4d6a1f0c4d]
> > Pointers86[0x4043f9]
> > ======= Memory map: ========
> > 00400000-00445000 r-xp 00000000 08:14
> > 2377106 /usr/local/bin/gbx3
> > 00644000-00645000 r--p 00044000 08:14
> > 2377106 /usr/local/bin/gbx3
> > 00645000-0064f000 rw-p 00045000 08:14
> > 2377106 /usr/local/bin/gbx3
> > 0064f000-00651000 rw-p 00000000 00:00 0
> > 01ade000-01aff000 rw-p 00000000 00:00 0
> > [heap]
> > 7f4d64000000-7f4d64021000 rw-p 00000000 00:00 0
> > 7f4d64021000-7f4d68000000 ---p 00000000 00:00 0
> > 7f4d69fbb000-7f4d69fd1000 r-xp 00000000 08:14
> > 1179728 /lib/libgcc_s.so.1
> > 7f4d69fd1000-7f4d6a1d0000 ---p 00016000 08:14
> > 1179728 /lib/libgcc_s.so.1
> > 7f4d6a1d0000-7f4d6a1d1000 r--p 00015000 08:14
> > 1179728 /lib/libgcc_s.so.1
> > 7f4d6a1d1000-7f4d6a1d2000 rw-p 00016000 08:14
> > 1179728 /lib/libgcc_s.so.1
> > 7f4d6a1d2000-7f4d6a34c000 r-xp 00000000 08:14
> > 1180003 /lib/libc-2.11.1.so
> > 7f4d6a34c000-7f4d6a54b000 ---p 0017a000 08:14
> > 1180003 /lib/libc-2.11.1.so
> > 7f4d6a54b000-7f4d6a54f000 r--p 00179000 08:14
> > 1180003 /lib/libc-2.11.1.so
> > 7f4d6a54f000-7f4d6a550000 rw-p 0017d000 08:14
> > 1180003 /lib/libc-2.11.1.so
> > 7f4d6a550000-7f4d6a555000 rw-p 00000000 00:00 0
> > 7f4d6a555000-7f4d6a55c000 r-xp 00000000 08:14
> > 2231491 /usr/lib/libffi.so.5.0.10
> > 7f4d6a55c000-7f4d6a75b000 ---p 00007000 08:14
> > 2231491 /usr/lib/libffi.so.5.0.10
> > 7f4d6a75b000-7f4d6a75c000 r--p 00006000 08:14
> > 2231491 /usr/lib/libffi.so.5.0.10
> > 7f4d6a75c000-7f4d6a75d000 rw-p 00007000 08:14
> > 2231491 /usr/lib/libffi.so.5.0.10
> > 7f4d6a75d000-7f4d6a775000 r-xp 00000000 08:14
> > 1180001 /lib/libpthread-2.11.1.so
> > 7f4d6a775000-7f4d6a974000 ---p 00018000 08:14
> > 1180001 /lib/libpthread-2.11.1.so
> > 7f4d6a974000-7f4d6a975000 r--p 00017000 08:14
> > 1180001 /lib/libpthread-2.11.1.so
> > 7f4d6a975000-7f4d6a976000 rw-p 00018000 08:14
> > 1180001 /lib/libpthread-2.11.1.so
> > 7f4d6a976000-7f4d6a97a000 rw-p 00000000 00:00 0
> > 7f4d6a97a000-7f4d6a97c000 r-xp 00000000 08:14
> > 1180008 /lib/libdl-2.11.1.so
> > 7f4d6a97c000-7f4d6ab7c000 ---p 00002000 08:14
> > 1180008 /lib/libdl-2.11.1.so
> > 7f4d6ab7c000-7f4d6ab7d000 r--p 00002000 08:14
> > 1180008 /lib/libdl-2.11.1.so
> > 7f4d6ab7d000-7f4d6ab7e000 rw-p 00003000 08:14
> > 1180008 /lib/libdl-2.11.1.so
> > 7f4d6ab7e000-7f4d6ac00000 r-xp 00000000 08:14
> > 1179958 /lib/libm-2.11.1.so
> > 7f4d6ac00000-7f4d6adff000 ---p 00082000 08:14
> > 1179958 /lib/libm-2.11.1.so
> > 7f4d6adff000-7f4d6ae00000 r--p 00081000 08:14
> > 1179958 /lib/libm-2.11.1.so
> > 7f4d6ae00000-7f4d6ae01000 rw-p 00082000 08:14
> > 1179958 /lib/libm-2.11.1.so
> > 7f4d6ae01000-7f4d6ae21000 r-xp 00000000 08:14
> > 1179985 /lib/ld-2.11.1.so
> > 7f4d6ae95000-7f4d6ae96000 rw-p 00000000 00:00 0
> > 7f4d6ae96000-7f4d6aed5000 r--p 00000000 08:14
> > 2237984 /usr/lib/locale/en_US.utf8/LC_CTYPE
> > 7f4d6aed5000-7f4d6aff3000 r--p 00000000 08:14
> > 2239899 /usr/lib/locale/en_US.utf8/LC_COLLATE
> > 7f4d6aff3000-7f4d6aff7000 rw-p 00000000 00:00 0
> > 7f4d6b00b000-7f4d6b00c000 r--p 00000000 08:14
> > 2237989 /usr/lib/locale/en_US.utf8/LC_NUMERIC
> > 7f4d6b00c000-7f4d6b00d000 r--p 00000000 08:14
> > 2232077 /usr/lib/locale/en_US.utf8/LC_TIME
> > 7f4d6b00d000-7f4d6b00e000 r--p 00000000 08:14
> > 2234328 /usr/lib/locale/en_US.utf8/LC_MONETARY
> > 7f4d6b00e000-7f4d6b00f000 r--p 00000000 08:14
> > 2235935
> > /usr/lib/locale/en_US.utf8/LC_MESSAGES/SYS_LC_MESSAGES
> > 7f4d6b00f000-7f4d6b010000 r--p 00000000 08:14
> > 2237938 /usr/lib/locale/en_US.utf8/LC_PAPER
> > 7f4d6b010000-7f4d6b011000 r--p 00000000 08:14
> > 2237858 /usr/lib/locale/en_US.utf8/LC_NAME
> > 7f4d6b011000-7f4d6b012000 r--p 00000000 08:14
> > 2235936 /usr/lib/locale/en_US.utf8/LC_ADDRESS
> > 7f4d6b012000-7f4d6b013000 r--p 00000000 08:14
> > 2235937 /usr/lib/locale/en_US.utf8/LC_TELEPHONE
> > 7f4d6b013000-7f4d6b014000 r--p 00000000 08:14
> > 2239858 /usr/lib/locale/en_US.utf8/LC_MEASUREMENT
> > 7f4d6b014000-7f4d6b01b000 r--s 00000000 08:14
> > 2233563 /usr/lib/gconv/gconv-modules.cache
> > 7f4d6b01b000-7f4d6b01c000 r--p 00000000 08:14
> > 2235940 /usr/lib/locale/en_US.utf8/LC_IDENTIFICATION
> > 7f4d6b01c000-7f4d6b020000 rw-p 00000000 00:00 0
> > 7f4d6b020000-7f4d6b021000 r--p 0001f000 08:14
> > 1179985 /lib/ld-2.11.1.so
> > 7f4d6b021000-7f4d6b022000 rw-p 00020000 08:14
> > 1179985 /lib/ld-2.11.1.so
> > 7f4d6b022000-7f4d6b023000 rw-p 00000000 00:00 0
> > 7fff5c542000-7fff5c557000 rw-p 00000000 00:00 0
> > [stack]
> > 7fff5c5ff000-7fff5c600000 r-xp 00000000 00:00 0
> > [vdso]
> > ffffffffff600000-ffffffffff601000 r-xp 00000000 00:00 0
> > [vsyscall]
> > /mnt/store/LINUX/DOCUMENTS/DEVELOPMENT/Gambas/Προγραμματισμός σε
> > Gambas/Το βιβλίο της Gambas3/Projects/Pointers86
> > ---------------------------
> >
> > the last line is in Greek some part, it is the name of current
> > directory.
> >
> >
> >
> > ------------------------------------------------------------------------------
> > Gaining the trust of online customers is vital for the success of any
> > company
> > that requires sensitive data to be transmitted over the Web. Learn how to
> > best implement a security strategy that keeps consumers' information secure
> > and instills the confidence they need to proceed with transactions.
> > http://p.sf.net/sfu/oracle-sfdevnl
> > _______________________________________________
> > Gambas-user mailing list
> > Gambas-user at lists.sourceforge.net
> > https://lists.sourceforge.net/lists/listinfo/gambas-user
> >
> ------------------------------------------------------------------------------
> Gaining the trust of online customers is vital for the success of any company
> that requires sensitive data to be transmitted over the Web. Learn how to
> best implement a security strategy that keeps consumers' information secure
> and instills the confidence they need to proceed with transactions.
> http://p.sf.net/sfu/oracle-sfdevnl
> _______________________________________________
> Gambas-user mailing list
> Gambas-user at lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/gambas-user
--
Regards,
Demosthenes
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